Pipe coupling or joint.



P. BOYD & J. A. HOGK. PIPE COUPLING-I013. JOINT. APPLICATION FILED. NOV. 21-. 1908.

' Batented Apr.20,1909.

/ I I A 7, I V w. 'M, 7,

siren snares PATENT orrron.

PETER. BOYD AND JOHN A. HOOK, OF PITTSBURG, PENNSYLVANIA, ASSIGNORS TO NA'llONAL TUBE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

.PIPE COO'PLING OB JOINT.

Specification of Letterslatent.

Patented April.- 20, 1909-.

epplieation'filed November 21, 1908. Serial No. 463,789.

To all whom it may concern:

Be it known that we, PETER Born and JOHN A. I'l'ocx, both of Pittsburg, Allegheny county, Pennsylvania, have invented a new and useful Improvement in Pipe Couplings or Joints, of which the following is a full, clear, and exact description, reference being had to the accom anying drawings, forming part of this speci lcation, in which Figures 1 and. 2 are longitudinal sections of two different forms of pipe joints or couplings embodying our invention.

Our invention relates to the class of pipe couplings or joints and is designed to provide a simple and eflicient form of con ling in which the weakening effect of three ing the 1 ends of the connected pipe sections is vercome"; in which the coupling is provided with an extended bearing upon the end portions of the connected ipe sections beyond their threads; and in w ich provision is made for bringing new threads into use to maintain the security of the coupling in case the threads originally used become worn.

The precise nature of our invention will be best understood by reference to the accon1- panying drawings, in which we have shown two forms of our invention, and Which will now be described, it being premised, however, that various changes may be made in the details of construction and arrangement of the parts without departing from the spirit and sco e of our invention as defined in the appen ed claims.

Referring first to Fi 1, the numerals 2 and 3 designate the en( portions of the two sections of pipe to be united and 4 designates the coupling sleeve. The end portion of each of the pipes 2 and 3 is. upset or thickened as shown at 5 and this upset or thickened portion is provided with exterior screw threads 6. The coupling sleeve 4 is provided with an internal thread extending )referably throughout its entire length, this t ireadengaging the thread 6 of the pipe members and also extending past the thread 6 so that the 1points of.

these t reads at the end portions of t 1e sleeve have abearing upon the plane, unthreaded outer surface of the pi )e members beyond the threads 6 as clearly shown in the drawing.

The construction shown in Fig. 2 is similar to that shown in Fig. 1, except that the end portions of' the pi e members are tapered as shown at 7 and t e coupling member 8 has a complementary taper in both directions threaded end from its center. It is well known that in the ordinary threaded pipe couplings of this gen eral class, the coupling is greatly weakened by the threading of the end portions of the pipe me1nbers.- y upsetting the end portions of the pipe members to an extent equal to the depth of the thread, 'we avoid this weakening and particularly at the points where the threads commence. By extending the ends of the coupling member or sleeve beyond the threaded end portions of the ipe members and causing the teethof the threads on the sleeve to bear upon the unthreaded portion of the pipe members, the coupling member or sleeve is given a bearing throughout its entire length and the coupling is thereby greatly enables either pipe member to be screwed in to a greater extent and thus Lake a bearing upon new threads in the coupling sleeveat any time.

1. A pipe coupling comprising pipe members having upset exteriorly threaded end portions and a coupling sleeve having an interior thread engaging the threads of said end portions and also engaging the unthreaded portions of the pipe members beyond their portions; substantially as described. I

2. A pipe coupling comprisin pipe members having upset end portions ormed with exterior threads and a cou ling sleeve having an interior thread throng rout its length engaging the exterior thread of the pipe Inem bers and also extending beyond said exterior threads and bearing upon the unthreaded portions of the pipe members; substantially as described. p

3. A pipe coupling com )risingpipe members having exteriorly t lreaded end portions thickened to an extent equal to the depth of the exterior threads formed thereon and a coupling sleeve internally threaded and engzwing the exterior threads of the pipe menl ers and also having its threads bearing upon the unthreaded portions of the pipe members substanltially as described.

4. A i'pe cou ing comprisin pipe members ha ing t'hiizkened exterioi ly threaded end portions, and a coupling sleeve having a continuous internal thread of a length mawhereby the threads at the end portions of terially greater than the combined length of the sleeve bear upon untlneaded portions of the external threads of the pipe members; the pipe members; substantiallyas described.

substantially as described. In testimony whereof, We have hereunto 5. A pipe coupling comprising pipe memset our hands.

-be1shaVing exteriorly threaded t ickened PETER BOYD.

1Q threaded'portions of the two pipe members,

end portions, and a couplin sleeve threaded 1 JOHN A. HOCK. inter'iorly from end to end 0 a length greater Witnesses: than the combined length of the exteriorly RENALD AILEs,

H. M. CORWIN. 

